According to Kelvin-Planck’s statement of second law of thermodynamics,  A. it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work  B. it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work  C. it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body  D. none of the above

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Answer: A

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